Molding wheel hubs



Oct. 15, 1929. F, Al-THOMANN 1,731,445

HOLDING WHEEL HUBS l Fiied sept. l2.2, 1924 Patented Oct. 15, 1929 UNITED STATES PATENT OFFICE FREDERICK A.. THOMANN, 0F EAST MOLINE, ILLINGIB, ASSIGNOR T0 DEEREv & COM- PANY, 0F MOLINE, ILLINOIS, A CORPORATION 0F ILLINOIS MOLDING WHEEL HUBS Application filed September 22, 1924. Serial No. 738,989.

My invention relates to metallic wheels,

particularly to Y that type commonly used or agricultural mechanisms, andthe obect of m device is .the production of a cast iub in w ich a certainart, ordinarily mountedon the hub after tige latter is completed, is placed Within the flask or mold from which 1t emerges as a fixed part of the cast hub.

Referring to the drawin sin which similar numerals indicate, identical; arts- Figure 1 is a longitudina section of a flask illustrating my invention.

Figure 2 is a longitudinal section of a completed hub embodying my invention, and

Figure 3 is a sectional view on thc line 3-3 of Figure 2, of a completed hub.

IrEhe flask is of a type known in the art and more fully illustrated and described in my co-pending application, of even date herewith; it is metallic' and is composed of interlocking parts 1 and 2 provided with `a spi-ue hole or gate 3 for passa e ofthe molten metal. Suitable openings in t e parts 1 and 2 are provided for insertion of a core 4. The path of the metal as it is poured in the flask is indicated by arrows in Figure 1.

It is evident that the result of using a metal desk, havin its interior conformed to the shape of a. hu ,is a chilled and very hard casting, consequentl to provide a threaded outer end to such a hu ,for reception of a dust cap, a find it necessary to utilize a collar 5 which 1s inserted in the flask, before the latter is assembled, in that partV in which the outer end of a hub is formed, and fitting therein to prevent the molten metal from reaching the outer circumference of the collar which is threaded as shown in Figures 1 and 2; a part of said circumference is not threaded, as at a, and projects into the larger portion of the flask so that the fiowing metal will envelop it when a cast is made.

To revent rotary movement of the collar 5 on t e outer portion 7 of the cast hub, studs 6 are formed, preferably integral with the collar 5, and project from the inner circumference of the collar to become embedded in the metal of the outer portion 7 of the hub, as shown in Figure 2. Longitudinal movement of the collar on the hub is prevented by tapering, internally, the collar 5, the tapered part 8 flaring outwardly from the studs G to the outer end of the collar, so that the molten metal filling between the core 4 and lthe entire inner surface of the collar will form, within the tapered portion of the collar, an expanded end to the cast hub, locking the collar against any possible longitudinal movemcut.

By the method of forming a chilled hub I with a collar inserted in the flask before the molten metal is poured and held securely as part of a completed hub, the collar heilig threaded externally, I have made it possible to cap the outer end of the hub, as shown in dotted lines in Figure 1, in an effective and economical manner.

What l claim is- 1. The method of producing a hub having an exteriorly threaded collar at one end, said method consisting of forming said collar -with an interior-ly tapered surface, providing a mold conforming tosaid hub and with a recess for said collar, placing the collar in said' recess, lacing a core in said mold extending tliroug said collar leavingr a space between said core and collar, and filling said mold-and space with molten metal.

2. The method of producing a hub having an exteriorly threaded collar at one end, said method consisting of forming said collar with an interiorly tapered surface with projecting studs, providing a mold conforming to said hub and with a recess for said collar, placing the collar in said recess, placing a core in the mold leaving a space between said core and collar, and filling said mold and space'with molten metal.

y FREDERICK A. THOMANN. 

